Introduction:
The wear-resistant thermistor and wear-resistant thermocouple share the same principle, using special heat-resistant materials and wear-resistant alloy materials as the temperature measuring sleeve and wear-resistant head. Depending on the measured temperature, the selected wear-resistant protection tube material is also different, using flange connection or threaded connection. It can be used for temperature measurement in the range of 0-1400 degrees for a long time, and is the most ideal temperature sensor for use in high-temperature and wear-resistant environments in metallurgy, chemical, cement plants, power plants, and fluidized bed boiler industries. The wear-resistant protection tube is equipped with an armored core, which has high wear resistance, corrosion resistance, oxidation resistance, and erosion resistance. The protective tube can also provide good protection for the armored core under high temperature conditions, with the highest service life. Long lasting for two years. The components of wear-resistant thermistor include wear-resistant head, connecting rod, threaded connection or flange, junction box, and armored core. The material of wear-resistant head should be selected according to the actual temperature on the production site, while the material of connecting rod, threaded connection or flange should be selected according to whether there is corrosive medium on site.
Material of wear-resistant thermistor protection tube:
1. High temperature alloy wear-resistant: Special heat-resistant and wear-resistant alloy materials are used as temperature measuring outer protective tubes, with armored cores inside, which not only have high corrosion resistance to particle erosion, but also provide good protection for the inner core under high temperature conditions. Using flange or threaded connection, temperature measurement can be carried out for a long time between 0 and 1200 ℃.
2. Composite casting wear-resistant alloy: using composite armor technology to add wear-resistant particles to a high-temperature alloy matrix and precision melt casting. No need for turning processing, high hardness of the casing, resistance to high-temperature oxidation, with slight casting defects but not affecting high-temperature wear resistance and sealing. It is the most common high-temperature wear-resistant casing used, with a moderate price and a temperature range of 800-1200 ℃.
3. Metal ceramic wear-resistant: using recrystallized silicon carbide metal ceramic protective tube, high temperature can reach 1300 ℃, equipped with K-index or S-index armored core, specially suitable for temperature measurement of high temperature and strong wear-resistant working conditions such as cement kiln tail and circulating vulcanization bed.
4. Ion implantation of tungsten carbide: Using stainless steel as the substrate, tungsten carbide particles are injected into the surface of the casing through ion implantation technology. It has high hardness, high strength, and high toughness, especially wear-resistant, with a wear-resistant layer thickness of 0.5-1.5mm. It is hard on the outside and tough on the inside, with a minimum diameter of up to φ 8, good surface quality, and can be used at temperatures ranging from 0 to 800 ℃. The service life of coal mills in power plants is over 2 years.
5. Iron aluminum ceramic protective tube: Iron based materials containing aluminum and cleverly added with Al2O3 powder are used to produce iron aluminum ceramic (TLC) with special gold content. By making the iron aluminum ceramic alloy into a thermocouple (resistor) protective tube, it becomes the most critical component of iron aluminum ceramic thermocouples (resistors) - the iron aluminum ceramic protective tube. According to the working temperature, wear condition, medium type, pressure equation, different series of iron aluminum ceramic protective tubes are made. There are currently five series: TLC, TLC1, TLC2, TLC3, TLC4.
TLC type: resistant to hydrochloric acid, nitric acid, sulfuric acid, sodium hydroxide, and potassium hydroxide solutions. The working temperature is divided into two types: 350 degrees and 750 degrees.
TLC1 type: resistant to oxidation, sulfurization, and zinc vapor corrosion, with high wear resistance, good heat and earthquake resistance, and a working temperature of 1100 degrees.
TLC2 type: Operating temperature of 1250 ° C, with lower wear resistance than TLC1 type. Compared with ceramic tubes, it has far superior technical indicators such as thermal shock resistance, high temperature thermal strength, and working pressure (16MPa), making it particularly suitable for thermocouple protection tubes with a scale of S at 1250 ° C.
TLC3 type: Improved from TLC2 type, it not only has the characteristics of TLC2 type, but also has a special improvement in wear resistance, far higher than TLC1 type. Under the same working conditions, it can increase the service life by twice. The working temperature is 1300 ° C.
TLC4 type: derived from TLC1 type, in addition to possessing the characteristics of TLC1 type, it has a special improvement in wear resistance, far higher than TLC1 type. Under the same working conditions, it can increase the service life by three times, with a working temperature of 1100 ° C. Through practical use, the service life of the protective tube used for temperature measurement at the inlet and outlet of the ball mill can reach 36 months.
Technical parameters:
1. Connection method: threaded connection or flange connection, can also be produced according to actual needs
2. Electrical outlet: M20 × 1.5 or NPT1/2
3. Wear resistant head hardness: HRC60-65
4. Protection level: IP65
5. Insulation resistance>100M Ω (at room temperature)
6. Test voltage: 500VDC
7. Connection size: M27 × 2 or NPT3/4, can be matched according to actual needs
8. Accuracy level: Level I

Model specifications:

model	Graduation	Temperature measurement range ℃	nominal pressure	velocity of flow	specifications
					d	L×L
WRNN-230 WRNN2-230	Pt100	0-800	≤100MPa	≤100m/s	Ф16	300×150 350×250 400×250 450×300 500×350 550×400 650×500 900×750 1150×1000
WREN-230 WREN2-230	Pt1000	0-600
WZPN-230 WZPN2-230	CU50	-200～500
WRNN-630 WRNN2-630	Pt100	0-800	≤30MPa	≤80m/s	Ф16
WREN-630 WREN2-630	Pt1000	0-600
WZPN-630 WZPN2—630	CU50	-200～500